command.h


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#ifndef __COMMAND_H_
#define __COMMAND_H_

#include <stdint.h>

#include "hiredis.h"
#include "adlist.h"

typedef enum cmd_parse_result {
    CMD_PARSE_OK,                         /* parsing ok */
    CMD_PARSE_ENOMEM,                     /* out of memory */
    CMD_PARSE_ERROR,                      /* parsing error */
    CMD_PARSE_REPAIR,                     /* more to parse -> repair parsed & unparsed data */
    CMD_PARSE_AGAIN,                      /* incomplete -> parse again */
} cmd_parse_result_t;

#define CMD_TYPE_CODEC(ACTION)                                                                      \
    ACTION( UNKNOWN )                                                                               \
    ACTION( REQ_REDIS_DEL )                    /* redis commands - keys */                            \
    ACTION( REQ_REDIS_EXISTS )                                                                      \
    ACTION( REQ_REDIS_EXPIRE )                                                                      \
    ACTION( REQ_REDIS_EXPIREAT )                                                                    \
    ACTION( REQ_REDIS_PEXPIRE )                                                                     \
    ACTION( REQ_REDIS_PEXPIREAT )                                                                   \
    ACTION( REQ_REDIS_PERSIST )                                                                     \
    ACTION( REQ_REDIS_PTTL )                                                                        \
    ACTION( REQ_REDIS_SORT )                                                                        \
    ACTION( REQ_REDIS_TTL )                                                                         \
    ACTION( REQ_REDIS_TYPE )                                                                        \
    ACTION( REQ_REDIS_APPEND )                 /* redis requests - string */                             \
    ACTION( REQ_REDIS_BITCOUNT )                                                                    \
    ACTION( REQ_REDIS_DECR )                                                                        \
    ACTION( REQ_REDIS_DECRBY )                                                                      \
    ACTION( REQ_REDIS_DUMP )                                                                        \
    ACTION( REQ_REDIS_GET )                                                                         \
    ACTION( REQ_REDIS_GETBIT )                                                                      \
    ACTION( REQ_REDIS_GETRANGE )                                                                    \
    ACTION( REQ_REDIS_GETSET )                                                                      \
    ACTION( REQ_REDIS_INCR )                                                                        \
    ACTION( REQ_REDIS_INCRBY )                                                                      \
    ACTION( REQ_REDIS_INCRBYFLOAT )                                                                 \
    ACTION( REQ_REDIS_MGET )                                                                        \
    ACTION( REQ_REDIS_MSET )                                                                        \
    ACTION( REQ_REDIS_PSETEX )                                                                      \
    ACTION( REQ_REDIS_RESTORE )                                                                     \
    ACTION( REQ_REDIS_SET )                                                                         \
    ACTION( REQ_REDIS_SETBIT )                                                                      \
    ACTION( REQ_REDIS_SETEX )                                                                       \
    ACTION( REQ_REDIS_SETNX )                                                                       \
    ACTION( REQ_REDIS_SETRANGE )                                                                    \
    ACTION( REQ_REDIS_STRLEN )                                                                      \
    ACTION( REQ_REDIS_HDEL )                   /* redis requests - hashes */                            \
    ACTION( REQ_REDIS_HEXISTS )                                                                     \
    ACTION( REQ_REDIS_HGET )                                                                        \
    ACTION( REQ_REDIS_HGETALL )                                                                     \
    ACTION( REQ_REDIS_HINCRBY )                                                                     \
    ACTION( REQ_REDIS_HINCRBYFLOAT )                                                                \
    ACTION( REQ_REDIS_HKEYS )                                                                       \
    ACTION( REQ_REDIS_HLEN )                                                                        \
    ACTION( REQ_REDIS_HMGET )                                                                       \
    ACTION( REQ_REDIS_HMSET )                                                                       \
    ACTION( REQ_REDIS_HSET )                                                                        \
    ACTION( REQ_REDIS_HSETNX )                                                                      \
    ACTION( REQ_REDIS_HSCAN)                                                                        \
    ACTION( REQ_REDIS_HVALS )                                                                       \
    ACTION( REQ_REDIS_LINDEX )                 /* redis requests - lists */                              \
    ACTION( REQ_REDIS_LINSERT )                                                                     \
    ACTION( REQ_REDIS_LLEN )                                                                        \
    ACTION( REQ_REDIS_LPOP )                                                                        \
    ACTION( REQ_REDIS_LPUSH )                                                                       \
    ACTION( REQ_REDIS_LPUSHX )                                                                      \
    ACTION( REQ_REDIS_LRANGE )                                                                      \
    ACTION( REQ_REDIS_LREM )                                                                        \
    ACTION( REQ_REDIS_LSET )                                                                        \
    ACTION( REQ_REDIS_LTRIM )                                                                       \
    ACTION( REQ_REDIS_PFADD )                  /* redis requests - hyperloglog */                        \
    ACTION( REQ_REDIS_PFCOUNT )                                                                     \
    ACTION( REQ_REDIS_PFMERGE )                                                                     \
    ACTION( REQ_REDIS_RPOP )                                                                        \
    ACTION( REQ_REDIS_RPOPLPUSH )                                                                   \
    ACTION( REQ_REDIS_RPUSH )                                                                       \
    ACTION( REQ_REDIS_RPUSHX )                                                                      \
    ACTION( REQ_REDIS_SADD )                   /* redis requests - sets */                              \
    ACTION( REQ_REDIS_SCARD )                                                                       \
    ACTION( REQ_REDIS_SDIFF )                                                                       \
    ACTION( REQ_REDIS_SDIFFSTORE )                                                                  \
    ACTION( REQ_REDIS_SINTER )                                                                      \
    ACTION( REQ_REDIS_SINTERSTORE )                                                                 \
    ACTION( REQ_REDIS_SISMEMBER )                                                                   \
    ACTION( REQ_REDIS_SMEMBERS )                                                                    \
    ACTION( REQ_REDIS_SMOVE )                                                                       \
    ACTION( REQ_REDIS_SPOP )                                                                        \
    ACTION( REQ_REDIS_SRANDMEMBER )                                                                 \
    ACTION( REQ_REDIS_SREM )                                                                        \
    ACTION( REQ_REDIS_SUNION )                                                                      \
    ACTION( REQ_REDIS_SUNIONSTORE )                                                                 \
    ACTION( REQ_REDIS_SSCAN)                                                                        \
    ACTION( REQ_REDIS_ZADD )                   /* redis requests - sorted sets */                        \
    ACTION( REQ_REDIS_ZCARD )                                                                       \
    ACTION( REQ_REDIS_ZCOUNT )                                                                      \
    ACTION( REQ_REDIS_ZINCRBY )                                                                     \
    ACTION( REQ_REDIS_ZINTERSTORE )                                                                 \
    ACTION( REQ_REDIS_ZLEXCOUNT )                                                                   \
    ACTION( REQ_REDIS_ZRANGE )                                                                      \
    ACTION( REQ_REDIS_ZRANGEBYLEX )                                                                 \
    ACTION( REQ_REDIS_ZRANGEBYSCORE )                                                               \
    ACTION( REQ_REDIS_ZRANK )                                                                       \
    ACTION( REQ_REDIS_ZREM )                                                                        \
    ACTION( REQ_REDIS_ZREMRANGEBYRANK )                                                             \
    ACTION( REQ_REDIS_ZREMRANGEBYLEX )                                                              \
    ACTION( REQ_REDIS_ZREMRANGEBYSCORE )                                                            \
    ACTION( REQ_REDIS_ZREVRANGE )                                                                   \
    ACTION( REQ_REDIS_ZREVRANGEBYSCORE )                                                            \
    ACTION( REQ_REDIS_ZREVRANK )                                                                    \
    ACTION( REQ_REDIS_ZSCORE )                                                                      \
    ACTION( REQ_REDIS_ZUNIONSTORE )                                                                 \
    ACTION( REQ_REDIS_ZSCAN)                                                                        \
    ACTION( REQ_REDIS_EVAL )                   /* redis requests - eval */                              \
    ACTION( REQ_REDIS_EVALSHA )                                                                     \
    ACTION( REQ_REDIS_PING )                   /* redis requests - ping/quit */                         \
    ACTION( REQ_REDIS_QUIT)                                                                         \
    ACTION( REQ_REDIS_AUTH)                                                                         \
    ACTION( RSP_REDIS_STATUS )                 /* redis response */                                   \
    ACTION( RSP_REDIS_ERROR )                                                                       \
    ACTION( RSP_REDIS_INTEGER )                                                                     \
    ACTION( RSP_REDIS_BULK )                                                                        \
    ACTION( RSP_REDIS_MULTIBULK )                                                                   \
    ACTION( SENTINEL )                                                                              \


#define DEFINE_ACTION(_name) CMD_##_name,
typedef enum cmd_type {
    CMD_TYPE_CODEC(DEFINE_ACTION)
} cmd_type_t;
#undef DEFINE_ACTION


struct keypos {
    char             *start;        /* key start pos */
    char             *end;          /* key end pos */
    uint32_t         remain_len;    /* remain length after keypos->end for more key-value pairs in command, like mset */
};

struct cmd {

    uint64_t             id;              /* command id */
    
    cmd_parse_result_t   result;          /* command parsing result */
    char                 *errstr;         /* error info when the command parse failed */

    cmd_type_t           type;            /* command type */

    char                 *cmd;
    uint32_t             clen;            /* command length */
    
    struct hiarray       *keys;           /* array of keypos, for req */

    char                 *narg_start;     /* narg start (redis) */
    char                 *narg_end;       /* narg end (redis) */
    uint32_t             narg;            /* # arguments (redis) */

    unsigned             quit:1;          /* quit request? */
    unsigned             noforward:1;     /* not need forward (example: ping) */

    int                  slot_num;        /* this command should send to witch slot? 
                                                                          * -1:the keys in this command cross different slots*/
    struct cmd           **frag_seq;      /* sequence of fragment command, map from keys to fragments*/

    redisReply           *reply;

    hilist                 *sub_commands;   /* just for pipeline and multi-key commands */
};

void redis_parse_cmd(struct cmd *r);

struct cmd *command_get(void);
void command_destroy(struct cmd *command);

#endif